Treasure hunter Martin Bayerle and his son return to the wreck that nearly destroyed their family, on an expedition to solve the mystery of the RMS Republic.
Martin unravels more of the mystery behind the Republic's treasure. And, during an attempt to recover the gold a panicking diver has an accident that puts his life in jeopardy and threatens to shut the mission down.
Martin follows the money trail through history and identifies a mysterious transaction with a Russian banker that may prove the gold is aboard the RMS Republic, while he and the salvage crew return to the wreck and zero in on her bounty.
When the ship's generator fails, and diver Mark's condition worsens, the crew must head back to port. And a devastated Martin recalls his failed 1987 Republic dive and the crushing effect it had on his life.